well it is actually megnetic and because bikes are not as big as cars we do not always trip them... SOme people say rubbing your kickstand on them helps...dunno. I have also seen these things and heard they are ok...but i cant say for sure http://www.discountbuy.com/greenlighttrigger/index.html
but I just let the light cycle once then blow the light..lol
but I just let the light cycle once then blow the light..lol